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4 years ago

8

Multiply (2x^2-3x+5)(x^2+4x+1)

1 answer:

Anton [14]4 years ago

7 0

The answer is B
100% use photomath
And sub to pewdiepie

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What is the surface area of the rectangular prism below <br> 7 7 14<br><br> A.496 B.490 C.980 D.248

ozzi

Answer:

B.490

Step-by-step explanation:

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3 years ago

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A store sells 8 cans of for $22. How much would it cost you to buy 3 cans of fruit cocktail? ?

r-ruslan [8.4K]

the answer is 8.25 or 8 1/4

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3 years ago

Josie read 246 pages of a book last month .Her older brother says he read about 3 to 4 times as many pages .Why is 2500 not a re

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Step-by-step explanation:

6 0

4 years ago

Do the points (−1,9) and (2,4) represent the vertex and a sample point, respectively, of y=−2(x+1)2+9? Explain

Reil [10]

Answer:

Vertex: (-1,9) is true

Sample Points: (2,4) is not true

Step-by-step explanation:

Given

$Vertex: (-1,9)$

$Sample\ Points: (2,4)$

Required

Determine if the vertex and sample points exist for $y= -2(x+1)\²+9$

Solving for the vertex:

$y= -2(x+1)\²+9$

Writing the given equation in the form:

$y = ax^2 + bx + c$

Expand the bracket

$y= -2(x+1)(x+1)+9$

Open Bracket

$y= -2(x+1)(x+1)+9$

$y = -2(x^2 + 2x + 1) + 9$

Open bracket

$y = -2x^2 - 4x -2 + 9$

$y = -2x^2 - 4x +7$

Solve for x using:

$x = \frac{-b}{2a}$

Where $a = -2$ ; $b = -4;$

<em>So:</em>

$x = \frac{-(-4)}{2 * (-2)}$

$x = \frac{4}{-4}$

$x = -1$

Substitute -1 for x in $y = -2x^2 - 4x +7$

$y = -2(-1)^2 -4(-1) + 7$

Simplify all brackets

$y = -2(1) + 4 + 7$

$y = -2 + 4 + 7$

$y = 9$

Hence;

<em>The vertex (x,y) is (-1,9)</em>

<em>This is true</em>

Checking sample points: $(2,4)$

In this case; $x = 2$ and $y = 4$

Substitute $x = 2$ and $y = 4$ in $y= -2(x+1)\²+9$

$4 = -2(2 + 1)^2 + 9$

$4 = -2(3)^2 + 9$

$4 = -2 * 9 + 9$

$4 = -18 + 9$

$4 \neq -9$

<em>Hence;</em>

<em>This sample points </em> $(2,4)$ <em> does not exist</em>

8 0

3 years ago